<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    /**
     * @param {string} a
     * @param {string} b
     * @return {string}
     */
    var addBinary = function (a, b) { // "11"   "1"

        

    }

    addBinary("11", "1")

</script>

</body>
</html>